ATI11 example - Displays diagnostic information for the last modem connection, such as DSP and firmware version, link type, line speed, serial speed, type of error correction/data compression, number of past retrains, etc.

The ATI11 results are listed on two screens. To get to the second screen, the user must hit any key. The following is an example of the ATI11 results.
Description Status Status
--------------- -------------------- --------------------
1 Last Connection 56K V.90
2 Initial Transmit Carrier Rate 28800 28800
3 Initial Receive Carrier Rate 50000 49333
4 Final Transmit Carrier Rate 28800 28800
5 Final Receive Carrier Rate 50000 49333
6 Protocol Negotiation Result LAPM LAPM
7 Data Compression Result V42bis V42bis
8 Estimated Noise Level 152 152
9 Receive Signal Poser Level (-dBm) 25 25
10 Transmit Signal Power Level (-dBm) 16 16
11 Round Trip Delay (msec) 4 4
Press any key to continue; ESC to quit
Description Status Status
--------------- -------------------- --------------------
12 Near Echo Level (-dBm) NA NA
13 Far Echo Level (-dBm) NA NA
14 Transmit Frame Count 3 3
15 Transmit Frame Error Count 0 0
16 Receive Frame Count 0 0
17 Receive Frame Error Count 0 0
18 Retrain by Local Modem 0 0
19 Retrain by Remote Modem 0 0
20 Rate Renegotiation by Local Modem 0 0
21 Rate Renegotiation by Remote Modem 0 0
22 Call Termination Cause 0 0
23 Robbed-Bit Signalling 00 00
24 Digital Loss (dB) 6 6
25 Remote Server ID 4342C3 NA
26 Last PCM S PTR
OK

Table 9. ATI11 Command Results
Result Description

Last Connection V.90, 56K, V.34, or V.32, depending on the type of connection negotiated.

Initial Transmit Carrier Rate Initial upstream rate.

Initial Receive Carrier Rate Initial downstream rate.

Final Transmit Carrier Rate Current or final upstream rate.

Final Receive Carrier Rate Current or final downstream rate.

Protocol Negotiation Result LAPM, MNP, or none, depending on V.42 negotiation.

Data Compression Result LAPM, MNP, V.42bis, or none, depending on V.42 negotiation.

Estimated Noise Level Mean-square error of received downstream signal. Difference between
received constellation point and reference decision point. This is a dimen-sionless decimal number that is only valid during a call. Higher numbers are worse. There is no absolute threshold of goodness; it depends on the downstream data rate. The number varies during a call, so it is useful to sample it a few times.

Receive Signal Power Level (-dBm) The received signal power, although labeled with units of -dBm, is only a relative measure for comparing calls to/from different locations. This value is valid only during a call.

Transmit Signal Power Level (-dBm) Upstream transmit signal power.

Round Trip Delay (ms) Round trip delay in milliseconds.

Near Echo Level (-dBm) Echo levels are valid for V.34 only.

Far Echo Level (-dBm) Echo levels are valid for V.34 only.

Transmit Frame Count Number of LAPM frames sent upstream during this call. Count wraps
around at 65535.

Transmit Frame Error Count Number of REJ frames received at the analog client modem.

Receive Frame Count Number of LAPM frames received by the client during this call. Count
wraps around at 65535.

Receive Frame Error Count Number of frames received in error by the client.

Retrain by Local Modem Number of retrains or rate renegotiations requested by the modem.

Retrain by Remote Modem Number of retrains or rate renegotiations requested by remote modem.

Rate Renegotiation by Local Modem Number of rate renegotiations requested by the local modem.

Rate Renegotiation by Remote Modem Number of rate renegotiations requested by the remote modem.

Call Termination Cause Reason for call ending. Only valid after call ends. Result codes are as fol-lows:
n 0 = local modem command: ATH, DTR drop.
n 1 = remote modem: cleardown, loss of signal.
n 2 = no answer, busy, etc.
n 3 = training failure V.90, K56flex, or V.34.
n 4 = protocol failure if required by \N4, for example.

Robbed-Bit Signaling For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with
robbed-bit signaling.

Digital Loss (dB) For PCM connection only, the downstream digital loss.

Remote Server ID For K56flex connection only, the V.8bis information sent by the server.

Meaning is defined at the server and by convention.

Last PCM S PTR Shows the last S pointer when the modem is expected to go to PCM mode.